Side seam for sheet metal can bodies



April 2s, 1939. P. E. PEARSON 2,156,0.26`

SIDE SEAM FOR SHEET METAL CAN BODIES I Filed April 10, 1957 www,

Patented Apr. 275, 1939* iJNITED STATES SIDE SEAltI FOR VSHEETAE'l'iHti-iN BODIES Paul E. Pearson,-Chicago, Ill., assignor to Continental Can Company Inc., New York, N. Y., a corporation of New vYork f i Appuauqnsprn 10,1931, serial No. 136.219 'z claim (c1. zzo-'15) The invention relates to new and useful improvements in'a sheet metal can body, and more i particularly to the side seam uniting the edge portions of the body blank which forms the can body. It is a common practice in making can bodies from sheet metal to prepare the blank by -shaping the end portions thereof so as to provide hooks which areinterlocked in the forming of the side seam. These hooks usually extend from one 1g end of the can body to the other, terminating short of the end where there are lap sections to facilitate the fianging of the can body. After the hooks have been formed, interlocked and bumped, then solder is applied to the *side seam for solder bonding the same.

An object of the present invention is to provide a solder bonded side seam of the above type wherein the edge portion of thefblank which is to form one of the hooks is cut so as to provide recesses at spaced intervals lying wholly within the hook portion and tongues which extend laterally of the side seam and overlap the body wall. A further object of the invention is to provide a. side seam of the above construction wherein the tongues overlie theouter face of the wall of the can body. l

A still further object of the invention lis to provide a sidev seam of the above type wherein the metal is deformed into the recesses in the hook o portion so as to substantially'fill the same.

These and other objects will in part be obvious and lwill in part be hereinaftermore fully dis'- closed.

In the drawing- Figure 1 is a plan view of a blank, notched and formed with slits in accordance with the present invention;

, Fig. 2 shows in plan 'one edge portion, wherein l the metal is out so as to form recesses in the hook and laterally projecting tongues, the hook being folded back on to the body of the blank;

' Fig. 3 is a sectional view on the line 3 3 of Fig. 2;

Fig. 14 is an enlarged view showing a portion of the can body with the seam completed and as viewed from the outside of the same;

Fig. 5 is a view showing the hooks interlocked and bumped;

5g Fig. 6 is a view similar to Fig. 5, butshowing the metal in the body wall carrying the inner hook as deformed into the recesses formed in the outer hook;

Fig. '1 is a view similar to Fig. 5, but showing the metal of the body wall carrying the outer hook and the inner hoek' demrmedso as to 11111 the recesses in the inner hook, and

Figure 8 is a sectional view through the side seam on a line intermediate the laterally project-v ing tongues and recesses, on the line 1-1. 5

In carrying out the invention, the :sheet metal is 4clit so as to provide the bodyvblank which is indicated at I inthe drawing. VThe body blank is notched as indicatedhat 2, 2 so `as to provide the@v usual lap sections at the ends of the side seam. 1o

'I'he hook portion 3 is formed by slitting the body blank in the usual manner. 'I'he hook portion 4v is formed by the notching of the body blank. .u Thef portion of the blank which forms ythe hook 4 is cut at spaced intervals along lines 5, E e'xtendli ing from the base line of the hook into the portion which is to form the hook. '".These lines along which the blank is cut lie wholly within the por-l tion which is to form the hook, so-.that the edge '6 `of the hook is continuousironioneend of the hook to the other. In Figure '4.1' the metal is shown as bent 'to form thevhook Whenthe.. ,g metal is bent to form the hook, the cutfout por-v tions are not folded with the 'hook-portiom but 1 are left projecting laterally from the edge of the).

blank, thus forming tongues 1, 1. 'I'his cutting of i the metal also provides recesses l, 8 inthe hook-v portion 4. Y v Y f Asshown in the drawing, it is the outer-hook, that is, vthe hook carried by the outer lapping'section ofthe body'blank that is cut so asto provide these spaced tongues and recesses. Thehook portion 3 is of the usual construction and forms theinner hook of the side seam. Whenthey hooks are interlocked as shown in Figure 5,- the tongues 1, 1 will -overlie the outer face 4glof the wall of the can body. As .shown in this Figure 5,during the bumpingdof theside seam the tongues `1 are forced against the body wall so as tobend the -same and vthe outer face of the tongues are sub- Wall. f

In Figure 6 of the drawing, 'the metal carrying the inner hook portion 3 is deformed as indistantially flush with the outer face of the body cated( at I0. This is done by a raised portion on 45 the' spline in the body making machine.` The metal is deformed into the recess, substantialLv filling the same. Theadjacent faces of the inner hook portion and the body wall carrying the inner hook portion are thus placed so that solder will ow by 'capillary attraction between said adpacent faces, thus joining the hook portions to the body wall which supports the same. In this manner, the inner hook is. in a sense, looped about the portion of the outer hook, lying between the i Z l edge of the hook: When the parts o! the outer hook tothe inner wall of the can :claim as newl and body so as to greatly strengthen-the side seam. The lapping tongues vfurther tie the metal supporting the outerhook to the inner body wall so as to prevent this hinging action which rupturesl the solder bond. The solder bond uniting the partsis indicated at Il inthe drawing'.

" It is 'obvious that minor changes in thedetails oi'construction andthe shaping oi' vthe tongues and the--arrangementthereof may be made without departing from' the spirit ofv the invention as seti'orthin thev appended claims, v

thus described the invention, what I desire 'to -secure by Letters LA sheet ymetal can body having its edge portions'Joinedi'na side= seam`f'including lap portions 'at .thev `ends of the side seam and inter- --lock'ing --hookportionsextending from the ,lap portion at one end thereoi'to ,the other, one of said interlocking hook portions having the meta! thereof cut at spaced intervals along lines extending irom the base of the hook toward the edge of the hook portion and terminating short of the edge of the hook portion, thus farming arecess in the hook portion located wholly within the hook portion, the metal oi' the body wall supporting the other hook portion being deformed into the recess and a solder bond uniting the lapand interlocked portions of the side seam.

2. A sheet metal can body having its edge portions Joined in a side seam including lap portions at the ends of the side seam and interlocked hook portions extending from the lap portions at one end of the seam to the lap por- "tions at the other end ofthe seam, said outer interlocking hook` portions having the metal thereof cut at spaced intervals along lines extending from' the base of the hook portion toward the edge thereof and terminating short of said edge, thus forming a recess in the hook portion lying wholly With-in the hook portion, the metal cut from the hook portion to form the recess forming tongues which extend laterally of the side seam and overlap the body wall, the metal of the body wall supporting the inner hook being v deformed into the recess in the outer hook and the solder bond uniting the lap and interlocked portions of, the side seam and uniting said t'ongues to the body'wall.

PAUL E. PEARSON. 

